Subdecadal‐scale vegetation responses to a previously unknown late‐Allerød climate fluctuation and Younger Dryas cooling at Lake Meerfelder Maar (Germany)

Engels, Stefan; Brauer, Achim; Buddelmeijer, Nico; Martín-Puertas, Celia; Rach, Oliver; Sachse, Dirk; Geel, B. van

doi:10.1002/jqs.2900

Cited by 17 publications

(15 citation statements)

References 42 publications

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“…Higher precipitation in late spring may reduce the length of the summer drought, and thus extend the period of permanent aquatic conditions, before the open water is transformed to shallow marsh later in the summer, which probably increases moisture at the lake margins and in surrounding hydromorphic soils. The topography of the site could also play a role in aquatic zone expansion (Engels et al 2016) and therefore also influence chironomid distribution, however our results do not provide enough information to elaborate on this point.…”

Section: Chironomids Along the Wetland Moisture Gradient: Implicationmentioning

confidence: 64%

“…Is typical of lentic water bodies (Gandouin et al 2006) having low connectivity with main channels and in ephemeral ponds (Karaus 2004) Chironomus Commonly confined to deeper parts of lakes, they can also be tolerant of hypoxic to anoxic waters anthracinus/plumosus-type (Brooks et al 2007;Zhang et al 2012), and to low values of pH (Brodin 1986) and high salinity (Vallenduuk and Moller Pillot 2002). Engels and Cwynar (2011) reported the presence of these taxa in circum-neutral aquatic environment in northeast USA Zavrelia A typical taxon of temperate eutrophic lakes (Brundin 1949;Walker et al 1991). Z. pentatoma has a widespread distribution in the eastern Palearctic region (Saether and Spies 2004).…”

Section: Taxon Ecologymentioning

confidence: 99%

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Late glacial and early Holocene hydroclimate variability in northwest Iran (Talesh Mountains) inferred from chironomid and pollen analysis

et al. 2017

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We reconstructed the paleohydrologic and climatic history of the Lake Neor region, NW Iran, from the end of the late glacial to the middle Holocene (15,500-7500 cal yr BP). Subfossil chironomid and pollen assemblages in a sediment core from a peatland located south of Lake Neor enabled identification of four main hydrologic phases. The period 15,500-12,700 cal yr BP was characterized by a relatively dry climate with an open landscape, suggested by the abundance of Irano-Turanian steppe plants (e.g. Amaranthaceae, Artemisia and Cousinia). Dominance of several shallow-water and semi-terrestrial chironomid taxa (e.

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Section: Chironomids Along the Wetland Moisture Gradient: Implicationmentioning

confidence: 64%

Section: Taxon Ecologymentioning

confidence: 99%

Late glacial and early Holocene hydroclimate variability in northwest Iran (Talesh Mountains) inferred from chironomid and pollen analysis

et al. 2017

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“…). Calcite varves are exceptional in the MFM sediments and occur only within the stage IVb and a short interval in the Allerød (Engels et al ., ). Calcite precipitation in mid‐latitude lakes is mainly induced by either seasonal increases in the photosynthetic uptake of CO 2 and/or periodic calcite supersaturation due to increasing water temperature following spring mixing (Kelts and Hsü, ).…”

Section: Discussionmentioning

confidence: 99%

Varved sediment responses to early Holocene climate and environmental changes in Lake Meerfelder Maar (Germany) obtained from multivariate analyses of micro X‐ray fluorescence core scanning data

Martín-Puertas

Tjallingii

Bloemsma

et al. 2017

J Quaternary Science

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We present an early Holocene record from Lake Meerfelder Maar in Germany for in‐depth interpretation of depositional changes in annually laminated lake sediments as proxies for climatic and local environmental changes. We characterized the compositional changes in the sediment record using Ward's clustering analyses of the micro X‐ray fluorescence core scanning data and linked these to microfacies descriptions. The down‐core distribution of the clusters allowed us to define boundaries that represent variations of a comprehensive element assemblage occurring at 11 555, 11 230, 10 650, 10 515 and 9670 varve a BP. Our main results show that during the Early Holocene the long‐term vegetation reorganization and evolution of the lake's catchment played a predominant role for sediment deposition. Abrupt shifts occurred at the Younger Dryas/Holocene and the Preboreal/Boreal biostratigraphical boundaries. We do not observe clear signals corresponding to known short‐term climatic oscillations described in the North Atlantic region such as the Preboreal Oscillation. A unique and intriguing episode in the history of the lake of predominantly organic deposition and very low amounts of allochthonous sediments occurred between 10 515 and 9670 varve a BP and is related to hydrological thresholds.

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“…Brundin, 1966), and Eggermont and Heiri (2012) show that globally different chironomid subfamilies have varying thermal optima. As chironomid-environment calibration data sets, as well as fossil data sets across a range of timescales, exist and are being developed, for example, Australia (Rees, Cwynar, & Cranston, 2008) is related to the more gradual nature of this transition, whereas the onset of the Holocene in Europe was more abrupt (Brauer et al, 1999;Engels et al, 2016) and therefore had a stronger impact on freshwater ecosystems, including the chironomid fauna of our study sites.…”

Section: Palaeoecological Evidence For Spatiotemporal Trends In Biomentioning

confidence: 99%

Temperature change as a driver of spatial patterns and long‐term trends in chironomid (Insecta: Diptera) diversity

Engels

Medeiros

Axford

et al. 2019

Global Change Biology

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Anthropogenic activities have led to a global decline in biodiversity, and monitoring studies indicate that both insect communities and wetland ecosystems are particularly affected. However, there is a need for long‐term data (over centennial or millennial timescales) to better understand natural community dynamics and the processes that govern the observed trends. Chironomids (Insecta: Diptera: Chironomidae) are often the most abundant insects in lake ecosystems, sensitive to environmental change, and, because their larval exoskeleton head capsules preserve well in lake sediments, they provide a unique record of insect community dynamics through time. Here, we provide the results of a metadata analysis of chironomid diversity across a range of spatial and temporal scales. First, we analyse spatial trends in chironomid diversity using Northern Hemispheric data sets overall consisting of 837 lakes. Our results indicate that in most of our data sets, summer temperature (Tjul) is strongly associated with spatial trends in modern‐day chironomid diversity. We observe a strong increase in chironomid alpha diversity with increasing Tjul in regions with present‐day Tjul between 2.5 and 14°C. In some areas with Tjul > 14°C, chironomid diversity stabilizes or declines. Second, we demonstrate that the direction and amplitude of change in alpha diversity in a compilation of subfossil chironomid records spanning the last glacial–interglacial transition (~15,000–11,000 years ago) are similar to those observed in our modern data. A compilation of Holocene records shows that during phases when the amplitude of temperature change was small, site‐specific factors had a greater influence on the chironomid fauna obscuring the chironomid diversity–temperature relationship. Our results imply expected overall chironomid diversity increases in colder regions such as the Arctic under sustained global warming, but with complex and not necessarily predictable responses for individual sites.

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Subdecadal‐scale vegetation responses to a previously unknown late‐Allerød climate fluctuation and Younger Dryas cooling at Lake Meerfelder Maar (Germany)

Cited by 17 publications

References 42 publications

Late glacial and early Holocene hydroclimate variability in northwest Iran (Talesh Mountains) inferred from chironomid and pollen analysis

Late glacial and early Holocene hydroclimate variability in northwest Iran (Talesh Mountains) inferred from chironomid and pollen analysis

Varved sediment responses to early Holocene climate and environmental changes in Lake Meerfelder Maar (Germany) obtained from multivariate analyses of micro X‐ray fluorescence core scanning data

Temperature change as a driver of spatial patterns and long‐term trends in chironomid (Insecta: Diptera) diversity

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